Systems and methods for suppressing sound leakage
A speaker comprises a housing, a transducer residing inside the housing, and at least one sound guiding hole located on the housing. The transducer generates vibrations. The vibrations produce a sound wave inside the housing and cause a leaked sound wave spreading outside the housing from a portion of the housing. The at least one sound guiding hole guides the sound wave inside the housing through the at least one sound guiding hole to an outside of the housing. The guided sound wave interferes with the leaked sound wave in a target region. The interference at a specific frequency relates to a distance between the at least one sound guiding hole and the portion of the housing.
1. A speaker, comprising:
a housing, the housing having an inner side facing the user;
a transducer residing inside the housing and configured to generate vibrations, the vibrations producing a sound wave inside the housing and causing a leaked sound wave spreading outside the housing; and
at least one sound guiding hole located on the inner side, the at least one sound guiding hole being configured to guide the sound wave inside the housing through the at least one sound guiding hole to an ear canal of the user and to a target region in surrounding environment, the sound wave guided to the target region having a phase different from a phase of the leaked sound wave, the sound wave guided to the target region interfering with the leaked sound wave, and the interference reducing a sound pressure level of the leaked sound wave in the target region.
2. The speaker of claim 1 , wherein the housing includes a bottom side and a sidewall, the bottom side facing away from the user and being opposite to the inner side of the housing, and the sidewall being located between the inner side and the bottom side.
3. The speaker of claim 2 , wherein the sound leaked wave is generated from a portion of the sidewall or a portion of the bottom side of the housing.
4. The speaker of claim 2 , wherein the sound leaked wave includes a first frequency in a low frequency range and a second frequency in a high frequency range.
5. The speaker of claim 4 , wherein the leaked sound wave of the first frequency and the leaked sound wave of the second frequency are generated from different portions of the housing.
6. The speaker of claim 5 , wherein the leaked sound wave of the first frequency is generated from a portion of the sidewall of the housing, and the leaked sound wave of the second frequency is generated from a portion of the bottom side of the housing.
7. The speaker of claim 5 , wherein the leaked sound wave of the first frequency is generated from a portion of the bottom side of the housing, and the leaked sound wave of the second frequency is generated from a portion of the sidewall of the housing.
8. The speaker of claim 2 , further comprising one or more sound guiding holes located on the sidewall of the housing.
9. The speaker of claim 1 , wherein the inner side of the housing contacts with a user's auricle, such that the at least one sound guiding hole faces the ear canal of the user.
10. The speaker of claim 2 , wherein the inner side of the housing including a layer of silicone rubber.
11. The speaker of claim 1 , wherein the at least one sound guiding hole includes a damping layer configured to adjust the phase of the sound wave guided to the target region.
12. The speaker of claim 1 , wherein the sound wave guided to the target region includes at least two sound waves having different phases.
13. The speaker of claim 12 , wherein the at least one sound guiding hole includes two sound guiding holes.
14. The speaker of claim 13 , wherein the two sound guiding holes are arranged to generate the at least two sound waves having different phases to reduce the sound pressure level of the leaked sound wave having different wavelengths.
15. The speaker of claim 1 , wherein at least a portion of the leaked sound wave whose sound pressure level is reduced is within a range of 1500 Hz to 3000 Hz.
16. The speaker of claim 15 , wherein the sound pressure level of the at least a portion of the leaked sound wave is reduced by more than 10 dB on average.
17. The speaker of claim 1 , wherein at least a portion of the leaked sound wave whose sound pressure level is reduced is within a range of 2000 Hz to 2500 Hz.
18. The speaker of claim 17 , wherein the sound pressure level of the at least a portion of the leaked sound wave is reduced by more than 20 dB on average.
19. The speaker of claim 1 , wherein the at least one sound guiding hole is not in contact with the user.
20. The speaker of claim 1 , further comprising a vibration conductive plate via which the transducer is fixed to the housing.